--- sg3_utils/scripts/rescan-scsi-bus.sh
+++ sg3_utils/scripts/rescan-scsi-bus.sh
@@ -222,7 +222,7 @@ sgdevice ()
       [ $? -eq 1 ] && return
     fi
     if ! echo "$DRV" | grep -q 'drivers: sg'; then
-      modprobe sg
+      $MODPROBE sg
     fi
     sgdevice24
     if [ $repdevstat = 0 ]; then
@@ -452,20 +452,20 @@ getluns()
 udevadm_settle()
 {
   local tmo=60
-  if [ -x /sbin/udevadm ] ; then
+  if [ -x "$UDEVADM" ] ; then
     print_and_scroll_back " Calling udevadm settle (can take a while) "
     # Loop for up to 60 seconds if sd devices still are settling..
     # This allows us to continue if udev events are stuck on multipaths in recovery mode
     while [ $tmo -gt 0 ] ; do
-      if ! /sbin/udevadm settle --timeout=1 | egrep -q sd[a-z]+ ; then
+      if ! "$UDEVADM" settle --timeout=1 | egrep -q sd[a-z]+ ; then
         break;
       fi
       let tmo=$tmo-1
     done
     white_out
-  elif [ -x /sbin/udevsettle ] ; then
+  elif [ -x "$UDEVSETTLE" ] ; then
     print_and_scroll_back " Calling udevsettle (can take a while) "
-    /sbin/udevsettle
+    "$UDEVSETTLE"
     white_out
   else
     sleep 0.02
@@ -799,7 +799,7 @@ findremapped()
 
   # Trigger udev to update the info
   echo -n "Triggering udev to update device information... "
-  /sbin/udevadm trigger
+  "$UDEVADM" trigger
   udevadm_settle 2>&1 /dev/null
   echo "Done"
 
@@ -996,11 +996,11 @@ reloadmpaths()
 
 resizempaths()
 {
-  local mpath
+  local mpath multipathd=multipathd
 
   for mpath in $mpaths ; do
     echo -n "Resizing multipath map $mpath ..."
-    multipathd -k"resize map $mpath"
+    $multipathd -k"resize map $mpath"
     let updated+=1
   done
 }
@@ -1169,7 +1169,7 @@ if [ ! -d /sys/class/scsi_host/ ] && [ ! -d /proc/scsi/ ] ; then
 fi
 
 # Make sure sg is there
-modprobe sg >/dev/null 2>&1
+$MODPROBE sg >/dev/null 2>&1
 
 if [ -x /usr/bin/sg_inq ] ; then
   sg_version=$(sg_inq -V 2>&1 | cut -d " " -f 3)
@@ -1290,6 +1290,9 @@ DMSETUP=$(which dmsetup)
 [ -z "$DMSETUP" ] && flush= && mp_enable=
 MULTIPATH=$(which multipath)
 [ -z "$MULTIPATH" ] && flush= && mp_enable=
+UDEVADM=$(which udevadm 2>/dev/null)
+UDEVSETTLE=$(which udevsettle 2>/dev/null)
+MODPROBE=modprobe
 
 echo -n "Scanning SCSI subsystem for new devices"
 [ -z "$flush" ] || echo -n ", flush failed multipath devices,"
@@ -1367,7 +1370,7 @@ if [ -n "$mp_enable" ] && [ $rmvd_found -gt 0 ] ; then
     flushmpaths 1
   fi
   if [ $found -gt 0 ] ; then
-    /sbin/udevadm trigger --sysname-match=sd*
+    "$UDEVADM" trigger --sysname-match=sd*
     udevadm_settle
     if [ -x "$MULTIPATH" ] ; then
       echo "Trying to discover new multipath mappings for newly discovered devices... "